This property consists of 12 villa complexes and two gardens owned by the Medici family in Italy's Tuscany region near Florence, including Villa della Petraia (pictured). The prominent dynasty played an influential role in Europe from the 15th to the 18th century, shaping the continent's...

This property consists of 12 villa complexes and two gardens owned by the Medici family in Italy's Tuscany region near Florence, including Villa della Petraia (pictured). The prominent dynasty played an influential role in Europe from the 15th to the 18th century, shaping the continent's... (Google Maps)

Mt. Etna, located in eastern Sicily in southern Italy, is one of the world's most active volcanoes, erupting over a dozen times this year alone, including this eruption in April. Its volcanic activity has been well-documented as well, with records dating back over 2,700 years.

Mt. Etna, located in eastern Sicily in southern Italy, is one of the world's most active volcanoes, erupting over a dozen times this year alone, including this eruption in April. Its volcanic activity has been well-documented as well, with records dating back over 2,700 years. (Carmelo Imbesi / Associated Press)

This national park in Tajikistan, which lies in Eastern Europe and borders China, encompasses one of the world's most tectonically-active regions in the world. It also contains the world's highest natural dam, behind which Lake Sarez (pictured) lies, and some of the world's deepest gorges.

This national park in Tajikistan, which lies in Eastern Europe and borders China, encompasses one of the world's most tectonically-active regions in the world. It also contains the world's highest natural dam, behind which Lake Sarez (pictured) lies, and some of the world's deepest gorges. (AFP / Getty Images)

When the UNESCO World Heritage Committee meets for its 37th session in Phnom Penh, Cambodia, in June it will review nominations for its well-regarded World Heritage List, which includes notable destinations such as Yellowstone National Park and the Galapagos Islands of Ecuador. Besides prestige...